Animation Module + Light of Promise + Ajani's Welcome + Phyrexian Altar

Animation Module

Light of Promise

Ajani's Welcome

Phyrexian Altar

How it works

1. Gain life.
2. The creature with Light of Promise attached triggers, putting a +1/+1 counter on it.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. When the Servo enters, Ajani's Welcome triggers, causing you to gain life.
5. The creature with Light of Promise attached triggers. Holding priority, activate Phyrexian Altar by sacrificing the Servo, adding 1.
6. Resolve the trigger from the creature with Light of Promise attached, putting a +1/+1 counter on it
7. Repeat from step 3.

This loop sets up a perpetual motion machine of growth and sacrifice, fueled entirely by life and a little bit of mana. With Light of Promise enchanting your creature, any lifegain transforms into an avalanche of +1/+1 counters, which immediately triggers Animation Module to offer a Servo artifact creature token for the low price of {1}. As that Servo enters, Ajani's Welcome hands you the life needed to kickstart the whole process over again. Finally, Phyrexian Altar acts as the engine's release valve, letting you sacrifice the newly minted Servo to generate the exact {1} mana demanded by Animation Module to keep the cycle spinning infinitely.